I agree with the suggestion that if you want to make bunker recovery less automatic, make the sand much softer so that a high spinning approach is more likely to bury. This wouldn't hurt poor players so much (as they are more likely to bounce into a trap or have a lower trajectory so it won't bury) It might even encourage players to use a lower running approach in certain cases to avoid the fried egg lie.
Jim Nugent,
I believe Rich's point is that all those simple putts from the fringe and easy chips that are nearly 100% saves for pros skew the results heavily. Watch a tour event for a couple hours and count how many times a player has a putt (or something he could putt if he wanted) as a percentage of the overall potential saves. I'll bet it is 15-20%, so if you eliminated those from the tally you'd probably find sand saves are at worst the same as other greenside shots, if not a few percentage points better. Remember, when someone is yelling "get in the bunker" they aren't yelling that if it might catch fringe. They are yelling it when it definitely won't catch fringe but is otherwise going to catch rough.
In addition, pros who hit into bunkers are usually short sided, making them much harder to get up and down from. For amateurs the distribution is probably a lot more random, since pins aren't as tight by certain bunkers in typical course setups and amateurs are less accurate so hooking a ball into the left bunker when shooting at a pin tucked front right is far more likely than it is for a pro. If a pro's golf ball was simply dropped into a random bunker around the green I'll bet they'd get at least 70% saves.
To illustrate this, I can point out a little personal anecdote. I tracked my sand saves among other stats for a season about 5 or 6 years ago and it was just over 50%, and I believe I've been fairly consistent in that regard over the years. Does that mean I'm as good as the pros in sand saves? Heck no! While I'm better than most, I'm sure there's no chance I'm as good as even the worst pro in that regard, if I had to play from where they do on the courses they do I'd probably be fortunate to manage a save one time in three.
One final consideration is that being in a bunker tends to minimize your chance for a double bogey. I might not save par every time, but I don't get many doubles from there. From rough, if you draw a bad lie you can either fluff or chunk it short and be faced with an up and down for bogey or catch a mini-flyer with lots of roll and put yourself over the other side or into potential three putt territory. Even if I had the exact same percentage of saves from the bunker as from greenside rough I'd still want to be in the bunker for that reason alone. The lies you find a maintained bunker are far more consistent than what you draw in rough, especially a course with some pretty gnarly greenside rough like mine.